EP0256222A2 - Balance for the continuous weighing and for the determination of the flow rate of bulk foodstuffs treated in a grain mill - Google Patents

Abstract

The weighing process uses a weighing pipe to which the bulk material is fed continuously, incorporating a shut-off slide cyclically opened and closed, with the increase in weight per unit of time being measured each time it is closed. The mean value is obtained from a large number of successive weighings and a computer is used for calculating the total amount of the bulk material flow. Pref. the duration of each closure cycle for the shut-off slide and hence each weighing internal is between 0.05 and 10 seconds, the intervals between the closure cycles pref. being freely selected in dependence on the bulk material flow stream.

Description

Technical field:

The invention relates to a flow weigher for detecting the throughput of a flow of flowable foodstuffs processed in a grain mill, comprising: a feed line section, a weighing section downstream of the feed line section and a discharge line section downstream of the weighing section.

Underlying state of the art:

In practice, there is often a need for grain mills to record the throughput of pourable food products processed there in a transport line for various reasons. For example, there may be a need to record the exact quantity of bulk material that has flowed through over a certain processing time, or to control the flow of bulk material with regard to an exact time throughput. So far mainly bulk scales and belt scales have been available for this. When it came to purely internal processes, the quality of the measurements was often not made too great. However, it is usually required that the bulk material flow should not be interrupted or should not be interrupted for a long time because of the measurement. In the area of Setreidemühlenalagen- pulse measuring devices have been used in more recent times, such as from _DE -2609167 or from DE-C-2342668 (disclosure date 7.3.74) are known.

A flow of bulk material falling onto a conventional balance initially does not result in a measurement value that can be used immediately for the measurement, since it is not possible without special devices to exactly measure the impulse component of the falling bulk material flow, which is also subject to fluctuations over time, as measured by the balance separate the weight fraction of the bulk material weight on the scale. In the known methods for measuring the throughput by means of pulse measuring devices, the vertically falling bulk material flow is deflected. The deflection results in a horizontal force component which is proportional to the quantity of bulk material falling on the baffle plate at the time, which is why the measurement of this force component allows a conclusion to be drawn about the throughput of the bulk material. With such a measuring signal _S may then be adjusted via chüttgutdurchsatz according dosing coupled to a desired value. The advantage of this known measuring method can be seen in the fact that the continuous flow of the bulk material flow is not interrupted even by the measurement and the product flow can be passed on as it strikes the measuring device. In addition, the manufacturing costs of such pulse measuring devices are considerably lower than those of previous weighing systems, such as batch or belt scales. The pulse measuring method has the disadvantage, however, that its accuracy is not all that great. Influencing factors such as air humidity or material moisture, temperature etc. can hardly be eliminated by measurement, so that in practice measurement tolerances in a range of -1% must be expected. With extreme fluctuations in the friction behavior between the product and baffle may even be more than 1%.

The endeavor _m ö i _{al c} hst in larger grain mills to be controlled by electronic computer and monitor bulk transport, however, makes the use of measured values with such fault tolerance not more. For a mill with a daily output of, for example, 500 t, a false indication in the range of 1% corresponds to a real bulk goods error of 5 t, which should completely question the possibility of computer control of such a mill.

DE-A-960 132 describes a method for measuring the throughput of a bulk material flow, in which the falling bulk material is diverted from the delivery line into a bypass and is introduced there into a balance arranged within a pipe cross section. The scale has a foldable bottom, which initially closes the cross section of the balance container downwards, so that the falling product is stacked on the bottom. The deflection flap, which deflects the bulk material from the main line into the bypass line of the balance, is coupled to a timer in such a way that, after a certain predetermined time, the introduction of the product into the bypass is canceled again and the main line is released. The balance is connected to a device for Anzeigung of the injected weight, so that the operator can read from this that amount of bulk material has been introduced within the known and predetermined time interval in the _V considering tank, from which then the throughput results directly in the main transport line. Then the bottom of the scales can be opened mechanically again, the product contained therein omitted, the bottom closed again and then the process repeated. Although this previously known device is fundamentally suitable for supplying measured values that allow conclusions to be drawn about the product throughput, it has disadvantages. To carry out the weighing, it is first necessary to switch the bulk material feed between the main line and the bypass line, which is fundamentally undesirable. Furthermore, the known method is also very slow, since it makes use of a mechanical weighing system, which in turn has to work with relatively long weighing times, which are dependent on the cycle of the mechanical sliders for introducing and discharging the main flow, all of which with a relative long cycle time of the entire process is connected, the duration of which can no longer be reduced. In addition, there is insufficient weighing accuracy, because the weighing container tare weight is not sufficiently taken into account as a disturbance variable. If, for example, the product adheres to the weighing container at the start of the weighing process, the result is a variable initial weight that cannot be neglected, but whose variability is not taken into account when determining the weighing value. This prior art is also unsuitable for using measured values derived from it for the computer control of an entire larger mill system, for example for the exact mixing of different product qualities or for controlling workflows via the product quantities.

Disclosure of the Invention:

Proceeding from this, the object of the invention is to find a device for determining the throughput of a flow of flowable foodstuffs processed in a grain mill that flows through a conveying line, said device determining the product throughput
with an accuracy of less than - 2 ° / .. and can also be used with an uninterrupted product feed, through which the accuracy of industrial scales is achieved, so that there is sufficient accuracy of the measured values for computer-controlled product flow monitoring: at the same time but at the same time the effort should be kept low.

According to the invention, this object is achieved in a continuous weigher of the type mentioned at the outset in that the three sections are designed and aligned with one another as a line section of a delivery line, in this case the inner cross section of the weighing section corresponds to the inner cross section of the feed line section and / or the discharge line section, the weighing section rests on electronic weight detection means and in the outlet region of the weighing section, an adjustable closure member connected to and supported by the latter is designed and arranged in such a way that it can be brought into a position closing the outlet region of the weighing section and into an open position ensuring an unhindered food outlet from the weighing section into the discharge line section.

The device according to the invention is obviously of simple construction and also requires only relatively small dimensions. The relatively long horizontal expansion required, for example, with belt scales, is eliminated, which not only results in a considerable saving in space, but also in a comparatively low outlay in terms of production. It also has the great advantage that, because of its design as a line section of the delivery line, it enables particularly space-saving and inexpensive use - even in existing delivery lines. The mutual adaptation of the internal cross-sections of the three sections of the flow weigher and the design of the closure member have the great advantage that no interfering effects are exerted on the product flow and self-cleaning is made possible, in particular no product residues get caught in the weighing section.

In a device according to the invention, the _weighing cut is particularly preferably provided with a cylindrical flow space, the height of which corresponds to 1.5 to 5 times its diameter.

In a further advantageous embodiment of the flow scales according to the invention, the closure member is designed as a sliding or swiveling closure slide, which is preferably actuated via a pneumatic cylinder, which in turn is controlled by a computer via an electro-pneumatic converter. This allows the slider can be moved with a controllable opening speed, which in any case allows the delivery of goods to be evened out after the completion of a weighing cycle.

Another advantageous embodiment of the flow scales according to the invention exists. also in the fact that a metering device is provided in the feed line section of the balance and is connected to a specification device for setting a preselectable continuous throughput, whereby, again preferably, a computer can be provided for controlling this specification device, which is connected to the output of the device for determining the throughput of the in bulk material located in the balance is controlled, and the computer, default device, metering device and device for determining the throughput form a throughput control device. The metering device for easily flowable bulk goods can advantageously be designed as a rotary slide valve, while it is particularly advantageously designed as a metering screw for poorly flowable bulk goods.

It is further if just above and the portion are connected immediately below the weighing section via a lateral _Dr uckausgleichsrohr freely with one another advantageous in the inventive passage scale the portion.

In the flow weigher according to the invention, there is also the advantageous possibility of not only using the same in a vertically running transport line, but even using it in inclined bulk material lines. The weighing section is then installed in a slope corresponding to the slope of the bulk material line, i.e. the central axes of the two coincide, or are at least aligned parallel to one another. Such an inclined installation option has the advantage that direct, even subsequent installation in existing silo systems with multiple cells can take place without providing an extra height.

Possible applications of the flow scales according to the invention are described in detail in the parent application, namely EP-A-0140213. In order to avoid repetitions, reference is expressly made to the aforementioned master application with regard to the possible uses of the flow scales according to the invention.

• Fig. 1 eine schematische Darstellung der Hauptelemente einererfindungsgemäßen Durchlaufwaage;
• Fig. 2 den Verlauf des gemessenen Schüttgutgewichtes pro Zeiteinheit während eines Wägezyklusses bei einer erfindungsgemäßen Durchlaufwaage;
• Fig. 3 eine diagrammatische Darstellung der Aufeinanderfolge mehrerer Referenzzeitabschnitte innerhalb des linearen MeBwertanstiegs der Waage (während eines Wägezyklusse);
• _Fig. 4 eine Prinzipdarstellung einer Ausführungsform der erfindungsgemäßen Durchlaufwaage mit einer kontinuierlichen Durchflußregelung;
• Fig. 5 ein Schaltschema zur Messung der Kräfte, die an einem in der Durchlaufwaage eingesetzen elektronischen Gewichtserfassungsmittel angreifen;
• _Fig. 6 eine Darstellung elektronischer Gewichtserfassungsmittel in Gestalt eines Dehnmeßstreifen-Wägebalkens;
• Fig. 7 eine Prinzipdarstellung einer weiteren Ausführungsform der erfindungsgemäßen Durchlaufwaage, die in einer senkrecht verlaufenden Transportleitung vorgesehen ist, mit einer Schiebersteuerung im Zulaufrohr;
• Fig. 8 eine Prinzipdarstellung der Anordnung einer weiteren Ausführungsform der erfindungsgemäßen Durchlaufwaage in einer schräg verlaufenden Transportleitung, mit der Möglichkeit einer Schiebersteuerung für die Zuführleitung.

The invention is explained in more detail below in principle by way of example with reference to the drawing. Show it:

• Fig. 1 is a schematic representation of the main elements of a flow scale according to the invention;
• 2 shows the course of the measured bulk material weight per unit of time during a weighing cycle in a continuous weigher according to the invention;
• 3 shows a diagrammatic representation of the sequence of a plurality of reference time periods within the linear rise in the measured value of the balance (during a weighing cycle);
• _F ig. 4 shows a basic illustration of an embodiment of the flow scales according to the invention with a continuous flow control;
• 5 shows a circuit diagram for measuring the forces which act on an electronic weight detection means used in the flow weigher;
• _F ig. 6 shows an illustration of electronic weight detection means in the form of a strain gauge weighing beam;
• 7 shows a basic illustration of a further embodiment of the flow scales according to the invention, which is provided in a vertically running transport line, with a slide control in the inlet pipe;
• 8 shows a basic illustration of the arrangement of a further embodiment of the flow scales according to the invention in an inclined transport line, with the possibility of a slide control for the feed line.

In Fig. 1, a continuous scale is shown as a weighing device, which has a feed line 2 in its upper area, a tubular weighing section in its central area, hereinafter referred to as a pipe scale 1, and a discharge line 3 in its lower area. The pipe scale 1 is provided with a closing slide 4, by means of which the outlet of the pipe scale 1 can be closed or opened. Furthermore, a computer unit 5 is also provided for utilizing the measurement signals supplied by the weighing device.

The main part of the pipe scale 1 is formed by a scale container 6, which is supported on pressure cells 7 or on other elements suitable for the rapid detection of current weight values. The scales container 6 is disposed in the illustrated schematic diagram and designed such is that it tung as part of the _F örderlei- arranged itself, which means it is provided with a flow space whose cross-section corresponds to that of the supply line 2 and the discharge line. 3 This ensures that the product arriving from the feed line 2 without one through the inner cross section of the scale container 6 can continue to flow into the discharge line 3.

The pressure transducers 7 pass on the signal generated by them and corresponding to the measured weight to a converter 8 which is connected to a computer 10 via an operating device 9. The converter 8 is also connected to an electro-pneumatic converter 11, which is connected to a pneumatic cylinder 12 for controlling the cycle play of the pipe scale 1. The arrangement shown enables simple electronic detection of the measured weight values and their forwarding to the computer 10 for calculating the desired product throughput (product quantity per time). Furthermore, a pressure compensation tube 13 is provided for eliminating such interference factors that arise from the fact that different pressure conditions can occur in the supply line 2 and the discharge line 3. For this purpose, the pressure compensation tube 13 connects a space 14 directly above the scale container 6 with a space 1-5 directly below the same, regardless of the position of the end slide 4.

FIG. 2 shows the course of the measured weight gain Q (in kg) over time t with a special use (not claimed here) of the continuous scale. Protection for the method practiced here and for the special features of the weighing system for carrying out this method is claimed in the parent application already mentioned.

The time I denotes the closing time of the balance outlet, ie the completion of the closing movement of the closing slide 4. It is assumed that there is a continuous flow of bulk material to the tube balance 1. With the closure of the closing slide 4 (time I), the scale container 6 now begins to fill, the weighing signal generated initially rising somewhat irregularly and with recognizable overshoots in accordance with the curve from the starting point I, because here the entire balance system is vibrated by the first impact pulse and therefore overshoots. With well-designed damping, however, a calming, which corresponds approximately to point D, has already occurred after a short time, in the example shown about 1 second. From point D on, a linear increase in the measured values begins to point E, at which the closing slide 4 is opened: in accordance with the now running out of the product, the weight in the tube scale 1 drops again to its zero value, after which the Libra. due to the inertia effects that occur, it even briefly sets a negative weight signal. Subsequently, the closing slide 4 remains open for a certain time until it is closed again: after the closing has been completed (renewed closing time of the balance exit or the closing movement of the closing slide 4 has ended), the whole process is repeated again, which is shown in FIG. 2.

It is essential for the described method that in the area of the linear measured value increase, ie in the area between the calming point D and the end point of the linear weight increase E at the beginning of the slide opening, the measurements required for the described method take place with simultaneous time recording. The point A _t is now the time assigned to the measuring point A, where A _{Gm is to be} the weight deflection measured here by the balance. B _t denotes the time assigned to measuring point B, and B _Gm is the measured value deflection for weight determined at point B ("weight deflection"). A reading of the measured value while the bulk material continues to flow in always records both the weight and the momentum of the falling product stream at the same time. Therefore, such an individual measurement can never be the absolute weight of the moment in the weighing container 6 represent piled bulk goods.

A measurement is then carried out within the linear range of the measured weight gain already mentioned, for example between points A and B, which is carried out over a very short reference time period Δ t. Since this is a very short-term process, it can be assumed that the change in momentum between point A and point B is so small that it can be neglected. It follows that in the calculation of the differential _r enz the values A _G and B _Gm, when the reference time interval is very short selected, a difference value in which the proportion is of the still detected pulse to the total signal seen by him to be negligible occurs, can and can thus be used as a sufficiently accurate difference value for the difference in weight between the time A _t and B _t even with the requirement of high accuracy.

auch als sekundlicher Massestrom = m oder aber als Steigungswinkel α (bzw. tanα) angegeben werden kann.

Hierin bezeichnet ΔG das Differenzgewicht und At die Dauer des Referenzzeitabschnittes.If the weight of the bulk material flow that has flowed into the balance is referred to as "bulk material throughput", this results from the relationship between the determined difference value on the one hand and the reference time period on the other hand as follows, the expression:

can also be specified as a secondary mass flow = m or as a slope angle α (or tanα).

Here ΔG denotes the differential weight and At the duration of the reference period.

This yields the measurement of the curve within the reference time period .DELTA.t a short-time measurement, from which very quickly and with great accuracy the value of the current _S chüttgutdurchsatzes can be determined easily. There is the possibility, as can also be seen from FIG. 2, that in the area of the linear measured value increase between points D and _E not only during a reference time period (points AB) but also during a further reference time period between points A ' and B 'an identical measurement is additionally carried out. If the reference time period Δt is chosen to be as large as that between points A and B, the throughput value that can be derived from the second measurement can be compared with the throughput value from the measurement during the first reference time period and, if there is a deviation, an average value are formed, which then reproduces the mean throughput between the times A _t and B ' _t with even greater accuracy. When using suitable weighing systems, there is no difficulty in carrying out a large number of such individual measurements, each carried out over an identical reference time interval Δt, within the linear increase in measured values between points D and E, and after each new measurement correcting the previously determined throughput value as part of a new averaging.

The above-mentioned measurement of the differential weight Δ G and the reference time period Δt also allows, if desired, the possibility to also fill the total weight of the weighing container 6 until it is emptied, i.e. between the time I and also to determine the point _e in the balance container 6 fed product weight in high accuracy. This is difficult because the differential weight AG measured within a reference time period is suitable. is extrapolated and extrapolated linearly, so that the weight difference between point E on the one hand and intersection II of the straight line of the linear measured value increase with the abscissa (time axis) on the other hand is calculated: this weight difference is then a very precise determination of the weight of what actually flowed into the container Bulk goods, which could be best proven by test results. In the event that an electronic balance is used for the acquisition of measured values, with which an integral evaluation of the measured value curve over time can take place, there is even the possibility that measured by a suitable electronic circuit for calculating the throughput or the bulk material weight fed into the balance container actual curve shape is replaced by a curve shape consisting of a straight line running through point E, for example, in which the integral over the period between its intersection with the abscissa and point _E is equal to the integral of the actually measured curve over the Period between points I and E.

3 shows the possibility of carrying out several weighing processes, ie weighing cycles, within a predetermined larger period. You can the Verwägungen labeled "Weighing" are viewed both as a complete, consecutive weighing cycles over an extended period of time, as well as individual _R eferenzzeitabschnitte within a single weighing cycle. The increase in individual measurements both within a Wägezyklusaes, and within a parent period in the form of an increase in the individual _W ägezyklen itself leads to a continuously improved and more precise determination of the desired values due to the detection of a larger number of individual measurements and the possibility of averaging then to achieve statistically improved values.

4 shows a further basic exemplary embodiment of the invention, in which, as an additional function, in addition to the weight or throughput detection of a continuous bulk material flow, a desired throughput rate can also be preset and even adjusted. For this purpose, the device shown has a computer 23 and an operating or default device 16, which has a first electro-pneumatic converter 17 and a pneumatic force diaphragm 19 with a metering element 18 and a second electro-pneumatic converter 20 with a pneumatic cylinder 21 and a closing slide 22 is connected. The pipe scale 1 (identical to the representation according to FIG. 1) allows the two aforementioned functions here. The opening position of the metering element 18 is adjusted in each case during a reference time period and is corrected for each repeated measurement. The throughput determined in each case is compared with a preset value and the desired throughput is continuously adjusted with the metering element 18. The metering element 18 can also be designed as a metering screw with variable speed for goods that are difficult to flow be.

6 shows in principle a strain gauge weighing beam which can be used in a device according to the invention for recording the measured values. It comprises a rigid support 30, a _B iegebalken 32 and a flange 34 for transmission of a force acting on it to P. The bending beam 32 consists of an elastic material and is designed in the manner of a four-bar system. For this purpose, it has a dumbbell-shaped opening 36, which is arranged centrally in the bending beam 32, in particular in such a way that its longitudinal axis coincides with the longitudinal axis of the bending beam 32. The middle part of the dumbbell-shaped opening 36 is provided with a rectangular cross section. The sections corresponding to the "weights" of the dumbbell, however, have a circular cross section. Each section of the opening 36 which is circular in cross section corresponds to two articulation points 38 and 40 or 42 and 44: these sections are therefore called "articulation points 38, 40, 42 and 44" in the following. When a force P acts on the flange 34, the bending beam 32 deforms essentially in the area of its four articulation points 38 to 44. The bending beam is in this case connected in a fixed manner to a rigid base via its support 30.

The dumbbell-shaped opening 36 is in _. The transverse direction is essentially delimited by two beam-like bending elements 52 arranged symmetrically to the longitudinal axis of the bending beam and in the longitudinal direction by two end pieces 54. The end pieces each connect two opposite ends of the bending elements 52 in pairs. The structure of the bending beam 32 thus obtained is therefore essentially parallelogram-like.

Electromechanical transducer elements 56 are fastened at the locations of the outer, mutually facing surfaces of the bending elements 52, which deform the most when the bending beam 32 is subjected to a force P. Since these are the articulation points 38 to 44, the transducer elements 56 are fastened on the sections of the outer surfaces of the bending elements 52 located above or below the articulation points. The four transducer elements 56 preferably have strain gauges, specifically two of them, optionally additional compensation resistances.

According to FIG. 5, the converter elements 56 are connected in a conventional manner in a bridge circuit. This bridge circuit is supplied by the voltage U _{in on the} input side and emits a signal U _out corresponding to the force measurement signal on the output side. The converter elements 56 can either consist of a parallel connection or of a series connection of a compensation resistor and a strain gauge or of a combination of said parallel and series connection.

The device shown in FIG. 6 additionally also has a securing rod 60 which supports the bending beam 32 in the event of an overload and which is rigidly connected via its rear end 62 to the carrier 30 and the end piece 54 of the bending beam 32 fastened thereon. For the rest, the purpose and design of the security rod is not essential for the further description of the invention.

The representations of FIGS. 7 and 8 are only intended to represent, in principle, a device constructed according to the invention in practical use both in a vertically running transport line (FIG. 7) and in an obliquely running transport line (FIG. 8). The same reference symbols in both figures mean the same construction elements.

In FIG. 7, the feed line 71 to the scale container 73 as well as the discharge line 72 are arranged to run vertically, while in FIG. 8 there is an oblique direction of transport. Interposed them is the pipe scale, the strength in the _F. 7 and 8 does not have its own reference number.

The product stream Q arrives in the feed line 71 in front of the balance. The end of the feed line 71 has a regulating slide 78, the position of which can be adjusted by means of a motor 80. This makes it possible to adjust the flow of material entering the balance container 73 as desired.

At the bottom of the scale container 73 there is a closing slide 76 which, in addition to its closed position, which is fully distinguished in FIGS. 7 and 8, can each be pivoted into a lateral opening position (shown in broken lines in FIGS. 7 and 8) to release the scale container 73, then the material (Q 2) piled up in the weighing container 73 can be discharged into the discharge line 72.

The scale container 73 is suspended in FIG. 7 via a measuring device 70, which is only shown schematically, relative to a holding frame 77, undesired movements being avoided by means of appropriately arranged stabilizers 82. With the arrangement according to ^FIG. 8, a stator 74 is provided, on which in turn the housing of the balance or the receiving housing of the balance container 73 is attached via a suitable measuring device 70th Here too, stabilizers 82 are arranged in a suitable form to keep the position of the balance stable. All suitable measuring devices for rapid (electronic) detection of the weight differences occurring, for example a strain, can be used as the measuring device 70 Measuring strip measuring arrangement, as can be seen from FIGS. 5 and 6.

It goes without saying that the arrangements illustrated only basically in the Fig 7 and 8 for an inventive device with an appropriate electronic device egeloperationen to perform the required for the inventive method Meßwertaufnahmeoperationen, control, and _R are provided. Such means is designated purely in principle by 75 in FIG. 7. By means of this device, as is not shown in detail in FIG. 7, all the necessary signals should be able to be recorded, processed and forwarded, which is why in particular the signal pick-up from the transmitter 70, the control of the closing slide 76 and the control of the adjusting motor 80 from the device 75 can be made in a suitable form.

The product Q conveyed in the feed line 71 is then admitted into the balance container-73 in accordance with the position of the regulating slide 78. When the gate valve 76 is closed, the product falls on the gate valve 76 and is accumulated there according to the inflow. As soon as the closing slide 76 is completely closed, the electrical measurement signal continuously emitted by the measurement device 70, which is a measure of the product weight accumulated in the weighing container 73, is derived from the device 75 and detected by it over time. At a point in time that can correspond to point in time A in FIG. 2, a certain initial quantity Q 1 is piled up in the balance container 73. Within a short reference time period _Ä t, the weight gain of the product inside the scale container 73 is now recorded, the amount of product Q 2 being to be contained in the scale container 73 at the end of the measuring period (the actual relative increase in the product quantities Q 1 and Q 2 is shown considerably distorted in FIGS. 7 and 8 in order to allow better clarity; in reality the level differences are much smaller relative to each other). This process can then be repeated several times until finally, due to a pulse by the device 75, the closing slide 76 is brought into its lateral opening position, after which the goods accumulated in the weighing container 73 are discharged downward into the discharge line 72. The slide valve 78 remains open for a certain time, with the contents of the balance container 73 generally being able to be completely emptied. The opening and closing duration of the weighing container 73 is selected eßvorgaben the corresponding _M the application conditions in a suitable form. The opening or closing speed of the end chopper 76 can also be set or predefined differently.

Claims (8)

1. Continuous scale for recording the throughput of a flow of flowable foodstuffs processed in a grain mill, flowing through a delivery line a) a feed line section (2; 71), b) a weighing section (6; 73) arranged downstream of the feed line section (2; 71) and c) a discharge line section (3; 72) arranged at a distance from the weighing section (6; 73)
characterized in that. d) that the three sections (2,6,3; 71,73,72) are designed as line sections of the delivery line and are aligned with one another, e) the inner cross section of the weighing section (6; 73) corresponds to the inner cross section, of the feed line section (2; 71) and / or of the discharge line section (3; 72), f) the weighing section (6; 73) rests on electronic weight detection means (7; 70) and g) in the outlet area of the weighing section (6; 73), an adjustable closure member (4; 22; 76) connected to and supported by the latter is designed and arranged in such a way that it closes the outlet area of the weighing section (6; 73) and can be brought into an open position ensuring an unhindered food outlet from the weighing section (6; 73) into the discharge line section (3; 72). 2. Flow weigher according to claim 1, characterized in that the weighing section (6) has a cylindrical flow space, the height of which corresponds to 1.5 to 5 times its diameter. 3. flow weigher arrangement according to claim 1 or 2, characterized in that the closure member (4; 22; 76) is designed as a sliding or pivotable end slide. 4. Continuous scale according to claim 3, characterized in that the end slide (4; 22) via a pneumatic cylinder (12; 21) can be actuated, which in turn via an electro-pneumatic converter (11; 20) from a computer (10; 23 ) is controlled. 5. Continuous weighing machine according to one of the preceding claims, characterized in that a metering device (18; 78) is provided in the feed line section (2; 71) and is connected to a specification device (16) 'for setting a preselectable continuous throughput. 6. Continuous weighing machine according to claim 5, characterized in that a computer (23; 75) for controlling the default device (16) is provided, which is controlled by the output of the device for determining the food throughput, and wherein the computer (23; 75), the default device (16), the metering device (18; 78) and the device for determining the food throughput form a throughput control device. 7. Continuous scale according to claim 5 or 6, characterized in that the metering device (18; 78) is designed as a rotary slide valve or as a metering screw. 8. Flow weigher according to one of the preceding claims, characterized in that the feed line section (2) directly above and the discharge line section (3) immediately below the weighing section (6) are freely connected to one another via a lateral pressure compensation tube (12).

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